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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8545e79cd00918fead0a62da971c0450f12e4e93ec4922d1dad653e01e7d553' 
  AND token = 's6H6lpEkXnyjfGqXFsv6hk+EeGZJb7INARI+AuTCBQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}